What are sexually transmitted diseases? List two examples of each disease caused

What are sexually transmitted diseases? List two examples of each disease caused due to
(i) bacterial infection and
(ii) viral infection.
Which device or devices may be used to prevent the spread of such diseases.

Sexually transmitted diseases spread through sexual contact in affected and healthy persons, for example; AIDS, Gonorrhoea and syphilis. AIDS is caused by HIV in humans.
Gonorrhoea: Caused by Treponema bacterium.
Syphilis: Caused by Neisseria gonorrhoea.
Prevention: Avoid sexual contact with affected person.